These things could reveal a biblical character (4)
I believe the answer is:
seth
'a biblical character' is the definition.
(I've seen this before)
'these things could reveal' is the wordplay.
'reveal' indicates the answer is hidden within the clue.
'SETH' is hidden within 'these things could'.
(Other definitions for seth that I've seen before include "said to sound archaic" , "Adam's third son" , "Indian writer" , "One of the first men" , "One of the first names recorded" .)